Hauv xyoo 1960, cov neeg ua haujlwm tshawb fawb thiab thev naus laus zis tau tsim LED teeb-emitting diodes siv lub hauv paus ntsiab lus ntawm semiconductor PN junction light-emitting.Lub LED tsim nyob rau lub sijhawm ntawd yog ua los ntawm GaASP, thiab nws cov xim yog xim liab.Tom qab ze li ntawm 30 xyoo ntawm txoj kev loj hlob, lub npe nrov LED muaj peev xwm emit liab, txiv kab ntxwv, daj, ntsuab, xiav thiab lwm yam xim.Txawm li cas los xij, LEDs dawb rau teeb pom kev zoo tsuas yog tsim tom qab xyoo 2000. Ntawm no, cov neeg nyeem tau qhia txog cov LEDs dawb rau cov teeb pom kev zoo.

txhim kho

Qhov ntxov tshaj plaws LED teeb qhov chaw ua los ntawm semiconductor PN hlws ris lub teeb-emitting txoj cai tawm thaum ntxov 1960s.Cov khoom siv nyob rau lub sijhawm ntawd yog GaAsP, uas tawm lub teeb liab (λp = 650nm).Thaum tsav tsheb tam sim no yog 20 mA, lub luminous flux tsuas yog ob peb txhiab ntawm lumens, thiab cov luminous efficiency yog li ntawm 0.1 lumen / watt.

Nyob rau hauv nruab nrab-1970s, cov ntsiab lus nyob rau hauv thiab N tau qhia ua kom LEDs tsim lub teeb ntsuab (λp = 555nm), lub teeb daj (λp = 590nm) thiab txiv kab ntxwv lub teeb (λp = 610nm), thiab luminous efficiency kuj tau nce mus rau 1. lumen/watt.

Thaum xyoo 1980s, LED teeb qhov chaw ntawm GaAlAs tau tshwm sim, ua rau lub teeb pom kev zoo ntawm LEDs liab mus txog 10 lumens / watt.

Nyob rau hauv thaum ntxov 1990s, ob yam khoom tshiab, GaAlInP, uas emits liab thiab daj lub teeb, thiab GaInN, uas emits ntsuab thiab xiav lub teeb, tau ntse tsim, uas zoo heev txhim kho lub luminous efficiency ntawm LEDs.

Xyoo 2000, qhov ua tau zoo ntawm cov LEDs ua los ntawm yav dhau los tau mus txog 100 lumens ib watt hauv thaj chaw liab thiab txiv kab ntxwv (λp = 615nm), thaum lub teeb pom kev zoo ntawm LEDs ua los ntawm tom kawg hauv cheeb tsam ntsuab (λp = 530nm) tuaj yeem ncav cuag 50 lumens./watt.